I’m always a bit surprised by the reactions I get from "non contractors" when they see these pictures and case studies. 
My problem is that I’ve been so conditioned after looking at these "hatchet jobs" day after day, that the only thing that surprises me is when I lose a job to a competitor because "Bubba & Skeeter" were $100.00 less than me on a $7,000 job. Proper etiquette says that you can’t tell the homeowner what you know about "Bubba & Skeeter" because then you’re "bashing" the competition.
(Understand that I use the name "Bubba & Skeeter" to refer to a generic competitor. If your name is Bubba or Skeeter, don’t email me!)
But regarding bad roofing jobs, If you saw what I saw on a daily basis, you really wouldn’t be as shocked as many of you are. Here’s why:"A roof is a roof, right?"
The report below was one I wrote for a gentleman in Portsmouth who had his roof done and "something just didn’t look right" so he called me.
A. VALLEY APPLICATION:
The valley is the most weather-exposed area of a slope roof system and subject to premature failure and leakage.
1. Page 69 of the CT MSA specifies that shingles should be cut back 2” from the valley centerline.
a. The shingles on the valley over the driveway were cut over the valley centerline.
2. “Neatly cut 2” back from the centerline, following the chalk line as a guide.”
a. The shingle were cut without a chalk line and present a very sloppy appearance.


B. PERPENDICULAR FLASHING AGAINST VERTICAL FRONT WALLS (APRON FLASHING):
1. The CT MSA is very clear that all vertical front walls require metal flashing to ensure that the shedding water from the siding does not run underneath the shingles.
2. The is NO FLASHING installed at any of the vertical front walls on this roof..


C. PIPE FLASHING:
1. Shingles should be cut to fit around vent pipe flashing collars
2. The shingles on this roof do not fit and are torn in these areas.

D. SHINGLE INSTALLATION:
1. STARTER SHINGLES – the starter shingles on this roof have been installed backward.
A. The starter shingles on this roof have been installed wrong. Written in the CertainTeed Master Shingle Applicator Manual (pb. 149) and on every shingle wrapper is the only acceptable method of installing the starter course:
B. The bottom of the shingle is cut off and the adhesive strip is at the base of the decking or pre-made starter shingles can be used.

SIMPLY “TURNING SHINGLES BACKWARD” FOR A STARTER COURSE WILL VOID THE MANUFACTURER’S WARRANTY.

2. SHINGLE FASTENING – The shingles on this roof are improperly fastened.
A. The CT MSA states, “Fastening instructions are stringent and must be followed.” (Page 147)
B. “It is critical to fasten the shingles in the proper locations in order to achieve designed performance. Improperly fastened shingles may blow off of slip out of place.” (Page 89)
C. “Fasteners should not go into, above , or between the self-sealing strips. If they do, the shingles may not seal properly and will be more likely to blow off.” (Page 89)

D. Fastening Certainteed Landmark laminated shingles
a. “Put the fasteners between the nail line, 5 5/8” from the bottom edge of the shingle.
b. “Put a fastener 1” in from each side edge.
c. “Place the other two fasteners 12” in from the same edges.”
E. Improperly driven nails have backed out and torn shingles on this roof.
APPLICATION METHODS FOR CERTAINTEED LANDMARK SHINGLES – the shingles on this roof have been applied improperly.
A. The CT MSA details on pages 149-151 the correct method for applying these shingles. These methods have not been followed on this roof.
B. CT MSA warns: “CAUTION! Failure to follow instruction steps 1-5 below will bring joints too close together and may cause unattractive patterns!” (Page 151)
a. The unattractive patterns that the manual warns about are present on this roof.

C. Shingle exposure should be installed at 5”. Greater on lesser exposures will prevent the shingles from sealing properly and void the wind warranty.
a. The exposures on this roof vary as much as an inch. This picture shows a 6 inch exposure and the exposed sealant strip of a shingle installed improperly.

D. According to Certainteed Roofing Products the shingles have two basic warranties:
a. The performance warranty.
b. The appearance warranty.
E. Installing the shingles in the manner that was used on this roof voids both of these warranties.

F. All exposed nailheads must be caulked to prevent rust and leaking. This was not done on this roof.

G. Shingle overhang should be ¾” (Page 149 CT MSA). The shingles on this roof have as much as 2” of overhang.

E. VENTILATION SYSTEM:
1. The shingle over ridgevent that is installed on this roof has two discrepancies:
a. It was not centered on the ridgeline.

b. The decking was not cut out on both sides of the ridgepole to allow the vent to work properly.
2. Bill Taylor, of Air Vent Products (manufacturer of the ridgevent), states that either of these discrepancies will void their performance warranty.
F. CONCLUSIONS:
1. A preliminary inspection of the roof has revealed some very fundamental flaws in the installation.
2. The roof installation does not conform to the manufacturer specifications detailed in the manual published by the manufacturer
3. The manufacturer would not stand behind any of their warranties on this roof due to improper installation.
4. The discrepancies and flaws are so extensive that no “repair” can bring the roof into alignment with the manufacturer’s specifications so that this roof is fully covered by all manufacturer warranties.
5. The roof must be re-installed to the manufacturer’s specifications.